file-eof.rs

use std::io::prelude::*;
use std::fs::File;
use std::thread;

macro_rules! iotry {
    ($e:expr) => (match $e { Ok(e) => e, Err(e) => panic!("{:?}", e) })
}

fn writer(mut f: File) {
    loop {
        iotry!(f.write_all(b"a"));
        thread::sleep_ms(2000);
    }
}

fn reader(mut f: File) {
    let mut buf = [0u8; 1];
    loop {
        let r = f.read(&mut buf);
        println!("{:?}", r);
        thread::sleep_ms(1000);
    }
}

fn main() {
    let f1 = iotry!(File::create("test.txt"));
    let writer_jh = thread::spawn(|| writer(f1));

    let f2 = iotry!(File::open("test.txt"));
    let reader_jh = thread::spawn(|| reader(f2));

    iotry!(writer_jh.join());
    iotry!(reader_jh.join());
}